AMON IC_HAWC NuEm-220116A: No neutrino counterpart detected with ANTARES
ATel #15165; Alexis Coleiro (APC/Universite de Paris) and Damien Dornic (CPPM/CNRS) on behalf of the ANTARES Collaboration.
on 18 Jan 2022; 07:55 UT
Credential Certification: Antoine Kouchner (kouchner@apc.univ-paris-diderot.fr)
Subjects: >GeV, TeV, Neutrinos
Using data from the ANTARES detector, we have performed a follow-up analysis of the recently reported AMON IC-HAWC coincidence alert NuEm-220116A [https://gcn.gsfc.nasa.gov/notices_amon_nu_em/0_105322.amon].
No up-going muon neutrino candidate events were detected within 3 degrees from the coincidence coordinate over a time period [21h13 - 23h26 UT] corresponding to 34.5% of the HAWC transit time mentioned in the AMON notice, and during which the potential source remained visible in the up-going field of view of ANTARES.
This leads to a preliminary 90% confidence level upper limit on the muon neutrino radiant fluence from a point source located at the coordinates of the coincidence as reported by AMON, of about 14 GeV.cm^-2 over the energy range 6 TeV - 6 PeV (the range corresponding to 5-95% of the detectable flux) for an E^-2 power-law spectrum, and about 31 GeV.cm^-2 (1 - 580 TeV) for an E^-2.5 spectrum. These indicative limits have been computed for the end of the HAWC transit time.
A search over an extended time window of +/-1 day has also yielded no detection (34% visibility).
ANTARES [https://antares.in2p3.fr] is the largest undersea neutrino detector (Mediterranean Sea) and it is primarily sensitive to astrophysical neutrinos in the TeV-PeV energy range. At 10 TeV, the median angular resolution for muon neutrinos is about 0.5 degrees. In the range 1-100 TeV ANTARES has a competitive sensitivity to this position in the sky.
